I beg to differ. Koalas are probably the most entertaining pets you could ever own. The last thing you want is for a pet to be smarter than you are... which is why I pick the Koala, because of it's unusally small brain. About 40% of the cranial cavity is filled with fluid, while the brain itself is like a pair of shrivelled walnut halves on top of a the brain stem... It is the only animal on Earth with such a strangely reduced brain.
The Koala lives almost entirely on eucalypt leaves. Since the leaves are low in protein, high in indigestable substances, and contain phenolic and terpene compounds that are toxic to most species, it is safe to say that this is most likely an evlutionary adaptation that takes advantage of an otherwise unfilled ecological niche.
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Like your sloth friend, Koalas have a very low metablolic rate for a mammal and rests motionless for about 18 to 20 hours a day, sleeping most of that time. During this time you really shouldn't mess with them because once disturbed they are known to be extremely violent, their teeth and claws are capable of causing considerable damage. But... if you ever get the chance to see one, it would be good fun to get one of your friends who probably know nothing about koalas to go and "poke" it. Maybe even video tape it and put it on Youtube... I was trying to find a video of an angry koala but no such luck.

AND... they are so gosh darn cute!
The nice thing about standards is that there are so many of them to choose from.
- Andrew S. Tanenbaum